Zobrazeno 1 - 10
of 13
pro vyhledávání: '"R. L. Doretto"'
Autor:
Leonardo S. G. Leite, R. L. Doretto
We study the flat-band ferromagnetic phase of the Haldane-Hubbard model on a honeycomb lattice within a bosonization scheme for flat-band Chern insulators, focusing on the calculation of the spin-wave excitation spectrum. We consider the Haldane-Hubb
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e8af3aaaa0096e4e56dc2b7174fbb84c
Autor:
R. L. Doretto
We study a system of interacting triplons (the elementary excitations of a valence-bond solid) described by an effective interacting boson model derived within the bond-operator formalism. In particular, we consider the square lattice spin-1/2 $J_1$-
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::63dd217f0a5d56f1c52fde996663c1fd
http://arxiv.org/abs/2003.07667
http://arxiv.org/abs/2003.07667
Autor:
Mark Oliver Goerbig, R. L. Doretto
Publikováno v:
Physical Review B. 92
We study the flat-band ferromagnetic phase of a topological Hubbard model within a bosonization formalism and, in particular, determine the spin-wave excitation spectrum. We consider a square lattice Hubbard model at $1/4$-filling whose free-electron
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bfadbe83cac1097ce57d2e21f7a0eeea
https://doi.org/10.1103/physrevb.92.245124
https://doi.org/10.1103/physrevb.92.245124
Autor:
B. Laks, R. L. Doretto
Publikováno v:
The Journal of Chemical Physics. 117:5437-5442
The electronic structures of poly(OSO) oligomers were theoretically analyzed. Models based on neutral and charged oligomers whose all rings (3
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6b5d3f91331d48f65c2f93197de7e76c
https://doi.org/10.1063/1.1499722
https://doi.org/10.1063/1.1499722
Autor:
R. L. Doretto
Publikováno v:
Physical Review B. 89
We study the plaquette valence-bond solid phase of the spin-$1/2$${J}_{1}$-${J}_{2}$ antiferromagnet Heisenberg model on the square lattice within the bond-operator theory. We start by considering four $S=1/2$ spins on a single plaquette and determin
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1784d0bac895c7117a76c22531a6141e
https://doi.org/10.1103/physrevb.89.104415
https://doi.org/10.1103/physrevb.89.104415
Autor:
Matthias Vojta, R. L. Doretto
Publikováno v:
Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Motivated by experiments on non-magnetic triangular-lattice Mott insulators, we study one candidate paramagnetic phase, the columnar dimer (or valence-bond) phase. We apply variants of the bond-operator theory to a dimerized and spatially anisotropic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::0e48ecc111cb1af8cf1b2214605074af
https://doi.org/10.1103/physrevb.85.104416
https://doi.org/10.1103/physrevb.85.104416
Publikováno v:
Scopus
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Physical Review B: Condensed Matter and Materials Physics (1998-2015)
Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2011, 83 (17), pp.174416 (13). ⟨10.1103/PhysRevB.83.174416⟩
Repositório Institucional da UNESP
Universidade Estadual Paulista (UNESP)
instacron:UNESP
Physical Review B: Condensed Matter and Materials Physics (1998-2015)
Physical Review B: Condensed Matter and Materials Physics (1998-2015), American Physical Society, 2011, 83 (17), pp.174416 (13). ⟨10.1103/PhysRevB.83.174416⟩
Made available in DSpace on 2022-04-28T23:48:52Z (GMT). No. of bitstreams: 0 Previous issue date: 2011-05-06 In certain Mott-insulating dimerized antiferromagnets, triplet excitations of the paramagnetic phase display both three-particle and four-par
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6c0c2ea0c431b299be3bf7d83c4b7e25
https://doi.org/10.1103/physrevb.83.174416
https://doi.org/10.1103/physrevb.83.174416
Publikováno v:
Physical review letters. 97(18)
We develop a non-perturbative bosonization approach for bilayer quantum Hall systems at \nu_T = 1, which allows us to systematically study the existence of an exciton condensate in these systems. An effective boson model is derived and the excitation
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::edc8a2260856274e72591251be009cd2
https://pubmed.ncbi.nlm.nih.gov/17155561
https://pubmed.ncbi.nlm.nih.gov/17155561
Publikováno v:
Physical Review B. 72
The spin-excitations of a fractional quantum Hall system are evaluated within a bosonization approach. In a first step, we generalize Murthy and Shankar's Hamiltonian theory of the fractional quantum Hall effect to the case of composite fermions with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a7e659fc4d10589799c304cebffa6e8
https://doi.org/10.1103/physrevb.72.035341
https://doi.org/10.1103/physrevb.72.035341
Publikováno v:
Physical Review B. 70
The non-monotonic behavior of the NMR signal linewidth in the 2D quantum Hall system is explained in terms of the interplay between skyrmions localization, due to the influence of disorder, and the non-trivial temperature dependent skyrmion dynamics.
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c7f280673a408eb6679ea906fd788342
https://doi.org/10.1103/physrevb.70.045319
https://doi.org/10.1103/physrevb.70.045319